Originally Posted by Phillbo
They should be above the waterline.
All through hull discharges are above the waterline. However an ingress of water through wave action will weight the boat down until they are no longer above the water. Then the entire boat is no longer above water. It's actually a common reason for boat sinking. When they say that most boats that sink, sink at the dock, it's not just failed hoses, seacocks and bellows. It's goofy stuff like this and blocked scuppers too.